add NetworkManager-dispatcher.service to 90-default.preset

https://bugzilla.redhat.com/show_bug.cgi?id=977433
diff --git a/90-default.preset b/90-default.preset
index c3f6ae0..92d07d8 100644
--- a/90-default.preset
+++ b/90-default.preset
@@ -8,6 +8,7 @@
 enable chronyd.service
 enable rpcbind.*
 enable NetworkManager.service
+enable NetworkManager-dispatcher.service
 enable ModemManager.service
 enable nm_dispatcher.service
 enable auditd.service